chiller pump stink

[todd516]

I have a chiller that has its own temp controller and i have pluged my water pump into the same plug as the chiller. This way the pump only comes on when the chiller does, saves on power. The only problem is the chiller might not come on for days at a time and when it does the water stinks like my skimmer on a bad day. Is this water bad now that is just sitting and can it hurt my fish.